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docs: Document VC4_DEBUG envvar

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Signed-off-by: Rhys Kidd <rhyskidd@gmail.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
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Rhys Kidd 2016-02-13 16:03:02 -05:00 • committed by Eric Anholt
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docs/envvars.html
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@ -253,6 +253,25 @@ for details.
</ul>
<h3>VC4 driver environment variables</h3>
<ul>
<li>VC4_DEBUG - a comma-separated list of named flags, which do various things:
<ul>
<li>cl - dump command list during creation</li>
<li>qpu - dump generated QPU instructions</li>
<li>qir - dump QPU IR during program compile</li>
<li>nir - dump NIR during program compile</li>
<li>tgsi - dump TGSI during program compile</li>
<li>shaderdb - dump program compile information for shader-db analysis</li>
<li>perf - print during performance-related events</li>
<li>norast - skip actual hardware execution of commands</li>
<li>always_flush - flush after each draw call</li>
<li>always_sync - wait for finish after each flush</li>
<li>dump - write a GPU command stream trace file (VC4 simulator only)</li>
</ul>
</ul>
<p>
Other Gallium drivers have their own environment variables. These may change
frequently so the source code should be consulted for details.